Electronic apparatus and fixing structure

A fixing structure for fixing, to a receiving member having an opening, an insertion member inserted through the opening and provided with a male thread on a peripheral surface thereof, the fixing structure comprising:

• a fastening member that is provided with a female thread on an inner surface thereof threadably engaged with the male thread, fixes the insertion member to the receiving member by engaging the female thread with the male thread, and covers the opening;
• and
• a first O-ring positioned between the insertion member and the fastening member and a second O-ring positioned between the fastening member and the receiving member, in a state in which the insertion member is fastened by the fastening member,
• wherein, when viewing each circular cross-section of the first and second O-rings along a surface parallel to a moving direction of the fastening member when fastening the insertion member by rotating the fastening member, a first point of each circular cross-section is pressed against a surface perpendicular to the moving direction, and
• a position displaced from a second point opposite to the first point of each circular cross-section is pressed against an inclined surface inclined to the moving direction.